Suggestions

VoidSpawn

Vintage80

Prevents people from jumping to the void and dying.

https://www.spigotmc.org/resources/voidspawn.19350/

Vintage80

I stg if u say "just do it on skript" ur gae, Alot of people don't know how to use skript so yeah

IDuckz_

just do it in command blocks

Vintage80

how

Viavir

Or just use multiverse portals and make a giant 1 block portal above the void that teleports you to spawn

CombatMC

From your comment I assume you are not looking for solutions that require Skript, which then The last time I use command blocks is about 2~3 years ago, I believe there are two ways to do it in command blocks.

Vintage80

ye but what command is it

CombatMC

The last suggestion comment is misclick, read this one instead.

From your comment, I assume you are not looking for solutions that require Skript, which then IDuckz_ mentioned about command blocks. The last time I use command blocks is about 2~3 years ago, I believe there are two ways to do it in command blocks. The first way is by having a command block repeating the command "teleport @a[condition that check for player's y coords lower than 0] ". The second way is by making a barrier platform under the map and having a command block that repeat the command "execute @a ~ ~ ~ check ~ ~-1 ~ barrier /teleport @r "

CombatMC

Even though you mentioned that you don't want to use Skript because most players don't know about it. I would still recommend you to use Skript as it is more stable than command blocks. If you never try it then you will never learn it.

IDuckz_

I would’ve said use skript but then that means I’m “gaeâ€